Updated: 2019-10-08 19:30:27A fairly rare large 3.6 EQ hit Lo'ihi, the next Hawaiian Island, a developing volcano off Hawaii, with interestingly enough, it's own underwater caldera. These do happen about 4 per year on average, but they come in spurts too.
The 2018 volcanic event saw such spurts, with 4 in 3 days.
But the remarkable issue, if the number of deep quakes is way up. Roughly 20 deep quakes since 1999, and the prior 20 years only had 1 deep quake.
Check it out. Good basic research to understand Hawaii.
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source : www.nukepro.net